You Observed Three Different Star Clusters and Found That the Main-Sequence

question 21

Multiple Choice

You observed three different star clusters and found that the main-sequence turnoff stars in cluster 1 had spectral type A,the main-sequence turnoff stars in cluster 2 had spectral type B,and the main-sequence turnoff stars in cluster 3 had spectral type G.Which star cluster is the oldest?

• A) cluster 1
• B) cluster 2
• C) cluster 3
• D) It is impossible to determine their ages given only the spectral types.

---

Definitions:

Social Media

Platforms and websites that enable users to create and share content or to participate in social networking.

Rights To Privacy

The entitlement of individuals to have control over and keep their personal information confidential.

Email

A method of exchanging digital messages over the Internet or other computer networks.

Voice Mail

An electronic system that records and stores voice messages for later playback by the intended recipient.